There is a SourceForge project called HibTags tha allows you to interact with Hibernate directly from your JSP pages.
Is this a good idea? Probably not, its use hardly follows any commonly accepted design guidelines for layering your architecture into separate layers each with its own concern (presentation, business, data access etc, at the very least).
This is probably in the same camp as the SQL JSTL tags, which are maybe useful for prototyping, but shouldn’t go far beyond that.